Crowd Farm, developed by two MIT architecture grad students, is a concept that harvests the energy that is transmitted through our feet. It works like this: Beneath highly crowded subway platforms there would be a sub-flooring system made up of blocks that depress slightly due to the force of human footsteps above. These blocks rub together under the pressure generating power the same way as a dynamo, a device that converts energy from motion into an electric current.
This is a concept that is only worth its weight in gold in highly crowded ares where the feet are many since one human footstep can generate enough power for two 60-watt light bulbs for only a mere second. But get a coffee-primed crowd moving by the masses and the Farm could be in business. The typical New York subway train in Manhattan at rush hour will typically have 300 people in it, all of whom ran an average of 150 steps in the station to get onboard. That is equivalent to 45,000 steps every few minutes, which could be transferred to power the subway train. This is a brillant idea for reclycling the energy from human movement.